局部向下延拓
partial downward continuation
局部虚拟向下延拓
local fictitious downward continuation
位场向下延拓
Downward continuation of potential field
向下延拓积分
downward continuation integral
虚拟向下延拓
fictitious downward continuation
重力场的虚拟向下延拓
fictitious downward continuation of gravity field
重力场向下延拓问题
downward continuation problem of the gravity field
向下向上焊
welding upward and downward
凹向下的
concave downward
concave downward‘ concave down
边界顺向延伸长度
tendency length of boundaries